Efficacy of CM-wire, M-wire, and nickel-titanium instruments for removing filling material from curved root canals: a micro–computed tomography study - Rodrigues, Clarissa Teles; Duarte, Marco Antonio Hungaro; Almeida, Marcela Milanezi de; Andrade, Flaviana Bombarda de; Bernardineli, Norberti (Journal of Endodontics, 2016)